Work holder for grinding machines



May 5, 1953 H. A. M QUARY WORK HOLDER FOR GRINDING MACHINES Filed Oct. 31, 1951 2 Sl-IEETS-SHEET l I N VENTOR A y/ammflwszm ATTORNEY w e m ATTORNEY 2 SHEETS-SHEET 2 H A M QUARY WORK HOLDER FOR GRINDING MACHINES May 5, 1953 Filed Oct. 31, 1951 UNITED YATES;

WQRK HOLDER roe GRINDING MACI-HNES HollisterA. McQuary, Washington, n. o.

Application October 31, 1951, Serial No. 254,041

2 Claims. 1

The invention relates to improvements in work holders for grinding machines, and is particularly designed for yieldingly and adjustably supporting planer knives in operative position with reference to a grinding tool or the like, whereby accurate grinding is insured without requiring special skill on the part of the operator.

One of the objects of the invention is to pro vide improved angular adjustment means for the work holder with reference to the grinding tool.

Another feature of the invention resides in the provision of an improved work carrying slide or carriage which is yieldingly mounted for angular adjustment with reference to the grinding tool.

In accordance with the preferred embodiment of my invention the work holder comprises an elongated base member or bed plate adapted to be rigidly secured in fixed position, a second elongated base member hingedly connected to the fixed base member, yielding adjustment means interposed between the two elongated base mesh-- here for varying at will their angular relation to each other, and a knife holder proper in the form of a carriage slidably mounted upon the angularly adjustable base member and adapted to be manually reciprocable so as to evenly present all portions of the cutting edge of the knife carried thereby to a grinder tool.

The device is characterized sturdiness, and adjustability.

The invention will be more readily understood by reference to the accompanying drawings, in which is set forth by way of illustration a specific embodiment of the invention.

In the drawings:

Fig. 1 is a rear view of the work holder showing the device in operative position with reference to a conventional grinding tool;

Fig. 2 is a plan view of the same showing one of the planer knives being engaged by a grinder tool;

Fig. 3 is an end view on a larger scale than Figs. 1 and 2;

Fig. 4 is a front view, with its ends broken away, of the slidable knife carrier member, showing the removable knife clamping strip and a knife secured thereby;

Fig. 5 is an exploded view showing the knife clamping strip, a filler strip and one of the blades; and

Fig. 6 is a perspective view looking from the rear of the slidable knife carrier member, which is shown removed from the base member.

Referring to the drawings, A denotes generally any suitable grinding wheel a portion only of by simplicity,

which is diagrammatically illustrated and which may be of any desired type. Co-acting with the grinding wheel is a work holder generally designated by reference letter B, designed for supporting planer knives or other suitable work yieldingiy in operative position with reference to the grinder wheel.

As shown, the work holder B comprises a fixed base member it which may be secured upon a supporting surface It, as, for example, a work bench or the like. The base member I0 is in the form of an elongated bar with flanges at its front and rear edges. Hingedly secured to the fixed base member and adapted to be angularly adjusted with reference thereto so as to properly present the work to the peripheral surface of the grinder tool is a second base or bar member i2 herein shown as secured to the fixed base member by means of a series of hinges 13 mounted upon blocks Hi carried by the fixed base member. It is a feature of the present invention to accurately vary the angular adjustment of the hinged base member if to the fixed base member Id and also to provide a yielding connection between the two. Any suitable means may be employed for this purpose within the scope of my invention in its broadest aspects. A preferred embodiment will now be described for the purpose of illustration.

As shown, a bracket is is centrally mounted on the rear of the hinged base member which bracket includes an arm 15 secured to the base member i2 and an arm iii extending rearwardly therefrom. An aperture (not visible in the drawings) is provided'in the arm It near the outer end thereof and through this aperture projects the upper threaded end it of a bolt or the like it, the lower end of which is hingedly mounted as at Iii in a recess formed in'a block it secured to the fixed base member iii. Surrounding the bolt it and reacting between the top of the block 20 and the under surface of the projecting arm 45 is a coil spring 2| which urges the arm It upwardly, but such upward movement is limited by a nut 22 fitted on the threaded upper end I! of the bolt. In this manner the hinged frame member l2 to which the bracket i4 is secured, together with the parts carried by the member l2, including the knives to be sharpened, is yieldingly held in any desired angular position with reference to the fixed base member is.

Slidably mounted on the hinged base member I2 is a knife carriage 25, shown removed from the base in Fig. 6. The knife carriage or slide comprises a rectangular bar of approximately the same width as the hinged base member 12, but considerably shorter. The carriage is provided with a continuous angular top strip 2'! projecting beyond the margin of the carriage and having a down turned flange adapted to fit over the upper edge of the hinged base member l2 and to act as a guide for the carriage. A pair of spaced lower guide members 28, 28 are also provided adapted to fit under the lower edge of the base member l2. A handle 29 with a hand hole 30 therein projects angularly upwardly from the rear of the top strip 21. The location and angularity of the handle together with the weight of the carriage are such that when the handle is held in the hand of an operator the slide or carriage member hangs at such an angle as to permit the guides 21 and 28 to be readily engaged with the base or bar member 12 from either end thereof. The continuous top strip or flange 21 in addition to serving as a guide for the carriage also serves as a shield against the grindings from the Wheel and the work being ground, while the spaced lower members 23, 28 prevent the accumulation of any grindings which may pass over the top strip 21.

One or more blades, knives or the like 43 to be sharpened, herein shown as three in number, may be mounted on the outer face of the slide or carriage 25. As shown, a clamping member 41 in the form of an elongated bar extending lengthwise of the slide for the full length there-- of is employed for securing the blades in place. The member 4| is detachably secured to the outer face of the carriage 25 by means of set screws 42, and at its upper portion is cut away to form a blade receiving groove or recess 43 between the clamping member M and the slide or carriage 25. A suitable filler strip 65 may be inserted within the groove 43, the size of which may be varied in accordance with the size of the blades or knives to be secured therein. The operation of the device will be generally apparent from the foregoing description.

When it is desired to sharpen planer knives or the like 40 these are secured within the recess 43 formed between the clamping bar 4! and the front face of the slide or carriage 2.3. It will be understood that the grinding tool A will be in approximately the position indicated in Figs. 1, 2 and 3 with reference to the work holder. After the blades have been clamped to the face of the carriage the carriage is assembled with the base member by sliding the same lengthwise with reference to the hinged bar 12. The grinding tool being suitably rotated the carriage is moved lengthwise until the cutting edges of all the blades have been successively engaged by the rotating grinder wheel, after which the carriage is moved in the opposite direction, this movement being repeated until the blades are properly sharpened. It will be apparent that the blades 4 will be yieldingly held against the surface of the grinding wheel and the exact angular position of the hinged base member and carriage slidably mounted thereon may be determined by suitable rotation of the wing nut 22 upon the threaded end of the bolt IS.

The invention has been described in detail for the purpose of illustration and it will be obvious that numerous modifications and variations may be resorted to without departing from the spirit of the invention. For example, while the clamping bar 4| is preferably formed of two separate bars of unequal Width secured together in any suitable manner, as by riveting, spot welding or the like, such clamping bar may be made in one piece and cut away to form the recessed portion 43. Also, various forms of grinding tools may be employed within the scope of my invention.

I claim:

1. A work holder for planer knives and the like adapted to be mounted in operative relation to a suitable grinding wheel, comprising an elongated fixed base member, an elongated rectangular bar member hingedly connected to the fixed base member, resilient means normally urging the hinged member angularly outwardly from the base member, adjustable means limiting the outward movement of the hinged bar member, and a knife carrying carriage in the form of a bar of substantially equal width with the hinged bar and having a continuous top flange and spaced bottom guide flanges for free slidable engagement with the hinged bar member, a handle for manually reciprocating the carriage, and a knife clamp extending the full length of the carriage and detachably secured to the outer face thereof.

2. A work holder as set forth in claim 1 wherein the location and angularity of the handle together with the Weight of the carriage are such that when the carriage is held suspended from the handle the carriage hangs at such an angle as to permit the guides to be readily engaged with the hinged bar member from either end thereof.

HOLLISTER A. MCQUARY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 507,634 Rogers Oct. 31, 1893 511,057 Obiols Dec. 19, 1893 1,016,585 Solem Feb. 6, 1912 1,872,096 Runshang Aug. 16, 1932 1,930,872 Moul Nov. 13, 1934 2,154,999 Seybold Apr. 18, 1939 FOREIGN PATENTS Number Country Date 509,479 Germany Apr. 20, 1931 

